Gas carburetor



y 23, 1940- R'. A. PEDUZZI 1 0 GAS CARBURETQR Filed Sept. 2a, 1938 INVENTOR Reyno/dAPedu zz i Patented July 23, 1940 NITED STA ES PATENT OFFICE 1"" 2 ,209,206 3 p Gas "(IARBURETOR Reynold AgPeduizzi, East Pittsburgh, Pa. Application September 28, 1938, Serial No. 232,105

3 class. 01. 48184) The present invention relates to carburetors and more particularly to carburetting devices for feeding a mixture of natural or artificial gas and air for purposes of combustion. By'this inven tion I provide a carburetting device in which the flow of gas therethrough and, consequently, the character of the mixture, is controlled by the throttle valve which also controls the-flow of the mixture into the device to be operated. The 0011-" trol by the throttle valve of the feeding of the gas into the device is effected by the use of a venturi in combination with the various other elements to be described for creating a vacuum for operating a pressure actuated valve which, in

turn, controls the flow of the gas.

In the accompanying drawing I have shown for purposes of illustration only a preferred embodiment of my invention. In the structure shown in the drawing the casing indicated generally by the reference character 2 is separated into two parts which are connected together by a tube 3 which is threaded into the gas valve portion 4 of the casing and. into the portion 5 of the casing which carries the throttle valve and venturi to be described hereinafter. The tube 3 provides a passageway for delivering gas from one portion of the casing to the other. It will be apparent that the casing may, if desired, be formed in a single piece.

The gas enters the portion 4 of the casing 0 through an opening 6 and is discharged there from into the portion 5 of the casing through the tube 3. A pressure actuated valve 1 is provided in the casing and cooperates with the valve seat 8. A threaded stud 9 is secured to one end of the 5 valve member. This threaded stud cooperates with a diaphragm l0 which is arranged to actuate the valve. The edges of the diaphragm ID are secured between the flange l I on the casing and the flange I2 on the cap l3 and the diaphragm extends across the chamber formed by the cap and the casing so as to provide a gas chamber M on one side thereof and an air chamber l5 on the other side thereof. Cups l6 are provided on opposite sides of the diaphragm I0 and these cups and the diaphragm are secured to the threaded stud 9 by means of nuts I1, metal washers l8 and leather washers l 9.

The pressure actuated valve 7 is normally urged toward closed position by a spring 20 cooperating with the end of the valve member opposite that to which the stud 9 is secured. One end of the spring bears against the valve member and the other end thereof bears against an adjusting nut 2| which is threaded in the tube 22 into which the spring projects. In order to adjust the pressure exerted by the spring on the valve it is merely necessary to adjust-the nut 2! within the tube. A lock nut 23 is provided for maintaining the adjusting nut in any adjusted position. The tube 22 is provided with a cap 24 which will nor- 5 mally be maintained-in the position shown to prevent any gas from escaping from the casing along the stem 25 which projects through the adjusting nut 2| and the lock nut 23. It is merely necessary to remove this cap 24 in order to obtain a0- 10 cess to the adjusting mechanism for effecting an appropriate adjustment of the tension exerted by the spring on the valve.

The portion 5 of the casing 2 is provided with an inlet opening 26 through which air is per- 15 mitted to enter. It is also provided with an outlet opening 21 for discharging the mixture of gas and air from the device. A choke valve 28 is provided in the air inlet opening 26 to regulate the flow of air. A throttle valve 29 is positioned 20 in the outlet opening 21 to regulate the flow of air and gas through the device. A venturi 30 is provided between the air inlet opening 26 and the discharge opening 21 and air in passing through the device must pass through the venturi. The 25 gas which is fed past the valve I through the gas chamber 14 and through the tube 3 is fed to the venturi by a discharge tube 3| which extends to a point within the venturi.

In operation, the throttle valve 29 is first 30 opened. This creates a vacuum which pulls air into the device through the air inlet opening 26 and as the air passes through the venturi 30 a partial vacuum is created in the discharge tube 3|. This, in turn, causes the pressure in the 5 chamber M to be reduced and due to the differ-- ence' in pressure on opposite sides of the diaphragm, the pressure in chamber l5 being greater than that in the gas chamber [4, the valve 1 will be forced from its seat and gas permitted 40 to flow into the device through the inlet opening 6. The gas, after it has passed the valve, passes through the chamber l4, through the tube 3, through the discharge tube 3| and through the venturi 30 where it is mixed with the air passing therethrough. The mixture is then permitted to pass into the manifold of the device to which the gas is being fed. It will be apparent that the amount of travel imparted to the valve 1 by the, diaphragm will be controlled by the spring 20 which can be adjusted so as to admit gas into the device in the quantity desired to provide a proper mixture. By adjustment of the spring any desired gas-air ratio can be achieved throughout 55 the entire range of throttle opening from no load to full load.

It will be apparent from what has been stated above that the flow of gas andair-through the device is controlled by the operation of the throttle valve 29 due to the creation of a vacuum which actuates the control valve through the diaphragm, oneside of which is subjected to the pressure within the device and the other side of which is subjected to atmospheric pressure byvirtue of the air vent 32. It will also be apparent that any suitable regulation of the quantity of gas flow can be satisfactorily effected by the apparatus above described.

While I have shown and described a preferred embodiment of my invention it will be understood that it may be otherwise embodied within the scope of the appended claims.

I claim: l. A carburetting device comprising a casing having-a gasinlet, a-n-air inlet and a discharge I outlet for the mixture of gas and air; a pressure sures therein for operating the pressure actuated valve.

2. A carburetting device comprising a casing having a gas inlet, an air inlet and a discharge outlet for the mixture of gas and air, a pressure actuated valve within the casing for controlling the flow of gas therethrough, a venturi between the gas inlet and the outlet and between the air inlet and the outlet, a throttle valve between the venturi and the outlet, a tube connected to the gas inlet and opening into the venturi for discharging gas passing through the device into the air stream passing therethrough, and a diaphragm within the casing and responsive to pressures therein for operating the pressure actuated valve.

3.A carburetting device comprising a casing having a gas inlet, an air inlet and a discharge outlet for the mixture of gas'and air, a pressure actuated valve within the casing for controlling 'thefiowof gas therethrough, a venturi between the gas inlet andthe outlet and between the air inlet andthe outlet, a throttle valve between the I venturi and the outlet, a passageway connected to the gas inlet and opening into the venturi for discharging gaspassing through the device into the air stream passing therethrough, and a diaphragm within the casing and responsive to pressures therein for operating the pressure actuated valve. v 1 V REYNOLD A. PEDUZZI. 1 

